Home / 3,971.70-5,474.34-2,790.72

Finding the Fourth Proportional to 3,971.70, 5,474.34 and 2,790.72

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Solution

The fourth proportional to 3,971.70, 5,474.34 and 2,790.72 is: 3,846.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,971.70 : 5,474.34 = 2,790.72 : x
  2. Step 2: Convert to fraction form
    3,971.70/5,474.34 = 2,790.72/x
  3. Step 3: Cross multiply
    3,971.70x = 5,474.34 × 2,790.72
  4. Step 4: Simplify right side
    3,971.70x = 15,277,350.12
  5. Step 5: Solve for x
    x = 15,277,350.12/3,971.70
  6. Step 6: Final answer
    x = 3,846.55

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.